DE2625587A1 - HOLLOW CONDUCTOR MADE FROM A WIRE SPIRAL AND PROCESS FOR ITS MANUFACTURING - Google Patents

Description

Fo 9999 DS ₁ June 1976

DIpI-InQ. Jürgen WeiNMILLER PATENT ASSESSOR

SOSP & GmbH 2625587

8OOO Munich 80

Zeppelinstrasse 63

LES CABLES DE LYON SA 170, avenue Jean Jaure * s
69353 LYON CEDEX 2, France

HOLLOW CONDUCTOR MADE FROM A WIRE SPIRAL AND THE PROCESS FOR ITS MANUFACTURING

The invention relates to waveguides for electromagnetic waves, which are formed from a wire spiral, the turns of which lie against one another and insulated from one another. This type of waveguide has the property of only transmitting the _{TE 01 wave type.}

It is known that in such waveguides there are connections between the attenuation of the TE _Q wave type and the proportion of interfering wave types on the one hand and the constancy of the internal dimensions of the waveguide and dielectric losses of the wire insulation on the other.

Therefore, waveguides have hitherto been produced in such a way that adjacent spiral windings of an insulated wire

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wound a calibrated mandrel and coated with an adhesive will.

This manufacturing method has several disadvantages. The relatively long drying time for the adhesive leads to the fact that the wound spiral windings must remain on the calibrated mandrel for a relatively long time. aside from that With this manufacturing method, it is not possible to use optimal insulating materials with regard to dielectric losses, i.e. thermoplastics from the class of polyolefins such as polyethylene, Teflon or polypropylene, as these substances Are adhesive-repellent, especially to epoxy resins. Furthermore, even if the gluing of these fabrics were through Surface treatment could be improved, the dielectric losses due to the adhesive layer to one lead to a relatively high damping factor.

The aim of the invention is to provide a waveguide formed from a wire spiral with very uniform internal dimensions and to create less attenuation.

The subject of the invention is a waveguide formed from a wire spiral, which is in an electrically conductive shielding tube is stuck and the wire windings are covered with an insulating material, characterized in that a thermoplastic Insulating material is used, the individual turns being welded to one another by surface melting of the thermoplastic insulating material are.

The invention also relates to a manufacturing method for a waveguide according to the main claim, characterized in that that first the electrically conductive wire covered with a thermoplastic insulating material with the help of a winding

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head is wound in adjoining spirals on a calibrated mandrel, the winding with a thrust ring is continuously moved on the mandrel during its manufacture, and at the same time the insulating sheath of the spirals is superficial is melted, and that then the waveguide into the electrically conductive formed from a somewhat larger metal tube Shield is pushed, whereupon the metal tube is reduced in diameter so that its inner wall the Outside of the waveguide just touched without the waveguide being deformed.

Features of preferred embodiments of the invention are characterized in claims 1 to 4. The invention will now be explained using an exemplary embodiment of its manufacturing method explained in more detail with reference to FIGS. 1 to 6.

Fig. 1 shows a waveguide according to the invention during manufacture.

Fig. 2 shows a portion of the FIG. 1 herge « put waveguide.

FIG. 3 shows an enlarged section through several adjacent turns of the waveguide according to FIG. 2.

Fig. 4 shows the insertion of the waveguide according to FIG. In a shielding tube.

FIG. 5 shows the arrangement according to FIG. 4 after reducing the shielding tube.

Fig. 6 shows a variant according to the invention of the conductive Shielding.

1 shows the essential components of a machine with which a waveguide according to the invention can be manufactured.

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The machine comprises a winding head 10 which is rotated around a mandrel 11 and a wire roll 15, a wire sensing device 13 and a thrust ring 12 comprises. These components are known and allow a winding 14 to be produced continuously with contiguous turns. If the winding head is rotated in relation to the mandrel 11, the wire 16 is of the Coil 15 unwound, runs through the wire guide device 13, through a feed channel provided in the thrust ring 12, and is in contact with a calibrated section of the dome 11 wound with the thrust ring 12, which is supported on the last turn produced, around the winding 14 during their Manufacture to slide on the mandrel 11 to the right. The voltage of the achieved, for example, by gently braking the coil 15 Wire 16 is adjusted so that the turns are regularly arranged one behind the other on the mandrel and thereby touch.

According to the invention, the wire used is not, as is usually the case, an enamel wire, but rather a wire covered with a thermoplastic insulating material; the insulating material is advantageously among polyolefins such as polyethylene, Teflon or polypropylene. Furthermore, it is not far from the thrust ring 12 near the last one wound turns a flame 17 arranged. Under the effect of the flame 17, the windings wound last, which slide along the mandrel 11, superficially heated, as a result of which their insulation melts locally and consequently the insulation of adjacent turns are welded together. The waveguide formed in this way is cooled before the calibrated part of the dome 11 leaves.

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Local heating can also be caused by other means. For example, you can do the warming by focusing light or infrared rays, by inflating it with a highly heated gas, by contact or sewing a warm body or by high-frequency heating, etc.

The mandrel 11 is preferably provided with a cooling means. For example, it is hollow and cold water flows through it, or it has a heat conduction (energy transport pipe) to quickly dissipate the heat released by welding Calories and for accelerated cooling of the waveguide.

The mandrel 11 is advantageously set in rotation in relation to the heating means 17 in order to ensure a more uniform welding to reach.

FIG. 2 shows a section of the helically wound wire 14, which forms the waveguide, and FIG. 3 shows an enlarged section through several adjacent windings of this wire. In Fig. 3 it can be seen that the individual Windings are firmly connected to one another by welding their insulation 18 on the outside of the winding.

According to a variant, to facilitate the welding between the insulation of adjacent turns the thermoplastic insulating layer (especially polyolefin) is a second, very thin layer made of a slightly polar insulating material Apply in the manner of graft polymerized polyethylene. This second layer also offers the advantage of facilitating the eventual connection of the waveguide to the shielding by means of heat gluing.

In a second manufacturing phase, the rest

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can run simultaneously with the first, a shielding tube 19 with thin walls and a diameter that is somewhat over which the winding 14 forming the waveguide lies, pushed over the waveguide. This pipe is then attached to the cut the desired length for transport reasons and then drawn through a drawing nozzle in such a way that its inner diameter reduced and the pipe inner wall almost touches the outside of the winding 14 while maintaining a very small amount of play, without there is a compression deformation of the winding 14 forming the waveguide.

FIG. 4 shows the winding 14 in the tube 19 before its reduction, FIG. 5 shows the winding in the tube 19 after its reduction. The tube 19 is preferably made of a highly conductive metal, for example aluminum. It can be done either by pulling or by seamlessly welding a thin ribbon.

In a variant according to FIG. 6, each pipe section is provided with a thin one on its inside at each of its ends Layer 20 of a thermally adhesive material such as graft polymerized polyethylene provided so that a subsequent Attachment to the winding 14 forming the waveguide is facilitated by heat bonding. An extendable mandrel holds meanwhile the winding 14 at the ends of the tube 19.

From Fig. 6 it can be seen that the layer of thermally adhesive material does not reach an open gap 21 in order to avoid that it is destroyed during the final welding of the gap 21.

The conductor obtained in this way can then be mechanically

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be protected, either by being drawn into a protective tube or by being coated or wrapped with an anti-corrosion material or by being inserted into a single sheath which is provided with connecting flanges at its ends. In
In this latter case, the shielding tube can be used during assembly
be centered with extendable thorns to form a single cover. In the case of waveguides drawn into a protective tube, the individual sections can be screwed using external screws before being drawn in
or glued thorns.

Within the scope of the invention, the shielding tube can also consist of a metal mesh or a non-welded metal band
getting produced. The reinforcement can also be made of epoxy resin
exist.

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Claims (1)

PATENT CLAIMS 1 -J Waveguide formed from a wire spiral, which is inserted into an electrically conductive shielding tube and whose wire windings are covered with an insulating material, characterized in that a thermoplastic insulating material is used, the individual windings being welded to one another by surface melting of the thermoplastic insulating material. 2 - waveguide according to claim 1, characterized characterized in that the electrically conductive wire covered with a thermoplastic insulating material with a very thin layer of a polar material in the manner of graft polymerized Polyethylene is covered. 3 - waveguide according to claim 1, characterized in that the shielding tube (19) on its ends on its inside with a thin layer (20) of a thermally adhesive material is coated for the Attachment of the waveguide inside the shielding tube ensures. 4 - waveguide according to claim 1, characterized in that the thermoplastic insulating material is chosen from polyolefins which include polyethylene, Teflon or polypropylene, among others. 5 - Manufacturing method for a waveguide according to the main claim, characterized in that the first covered with a thermoplastic insulating material 609853/0702 electrically conductive wire with the help of a winding head in contiguous spirals on a calibrated mandrel (11) is wound, the winding (14) being moved continuously on the mandrel with a thrust ring (12) during its manufacture becomes, and at the same time the insulating cover of the spirals is superficial is melted, and that then the waveguide into the electrically conductive formed from a somewhat larger metal tube (19) Shield is pushed, whereupon the metal tube is reduced in diameter so that its inner wall the Outside of the waveguide just touched without the waveguide being deformed. χ χ 609853/0702